利用ABAQUS有限元软件建立了镁/钛异种金属冷金属过渡焊接头的有限元模型,对焊接过程中接头的应力场进行了有限元模拟,分析了不同的焊接参数和约束条件下应力场的变化规律,并对模拟结果进行了试验验证.结果表明:随着焊接过程的进行,焊缝处的横向应力和纵向应力均由压应力向拉应力转变;在焊接接头完全冷却后,镁侧的最大横向残余拉应力值为88 MPa,钛侧的为192 MPa;在焊接接头完全冷却后,焊缝两侧的纵向残余拉应力峰值基本相等,大约为220 MPa,钛侧的纵向残余压应力值较大,最大值为265 MPa;采用耦合约束后,模拟得到的残余应力值与试验测试结果更接近.
Finite element model of Mg/Ti dissimilar metal joint welded by cold metal transfer method was established by ABAQUS finite element software, and stress field of joints during welding process was simulated.The variation regularity of simulated stress field with different welding parameters and constraints was studied and compared with test results to further confirm the accuracy of the simulation results.The results show that the transverse and longitudinal stress at the weld seam were changed from compression stress to tensile stress during the welding process.After the welding joint was completely cooled, the maximum transverse residual tensile stress reached 88 MPa at the magnesium sheet and 192 MPa at the titanium sheet.After the welding joint was completely cooled, the peak value of the longitudinal residual tensile stress at both sides all reached about 220 MPa.The residual longitudinal compression stress at titanium side was more than that of the other side, which had a maximum of 265 MPa.The residual stress results by finite element simulation with coupled constrained boundary condition were close to that of the test results.
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